Watch movement balance part



FIG. 1 is a top perspective view of a watch movement balance partshowing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top thereof.

The portions of the watch movement balance part shown in broken linesform no part of the claimed design.

The ornamental design for a watch movement balance part, as shown anddescribed.